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I don’t understand the question. The right pin measurement for what? For limiting capacity? If it’s for limiting capacity, the right measurement is 5 rounds of .223/5.56, not 6.
Maybe, these will help. My late bro was a machinist and over engineered this one....you want to go slightly past 5 rds (5 1/2), otherwise you will get frustrated trying to load 5 and turn your mag into a 4/20 rd....
Maybe, these will help. My late bro was a machinist and over engineered this one....you want to go slightly past 5 rds (5 1/2), otherwise you will get frustrated trying to load 5 and turn your mag into a 4/20 rd....View attachment 295389
Bro was a machinist and a perfectionist......then he realized how long it would take the drill, tap and grind the pins on the rest of his mag collection.